| 1 | Each diode is cut from a wafer of crystals layered over a base of silicon or sapphire. | |
| 2 | When such a liquid enters the network, it changes the chip's color over a set area. | |
| 3 | An inverse opal is a chip of layered glass that includes numerous tiny channels. | |
| 4 | With this so-called Watermark Ink writing, the chips could also serve as secret code devices. | |
| 5 | Its main wafer plant in Shirakawa was damaged by the earthquake, and the factory is down. |
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